Lecture 9

Question 1

interosseus membrane

Answer 1

fibrous connective tissue membrane between the shafts of the radius and ulna

Question 2

Compartments of forearm

Answer 2

anterior:
superficial, ontermediate, deep
posterior:
superficial, deep

Question 3

Pronator teres: origin

Answer 3

medial epicondyle of humerus

Question 4

Pronator teres: insertion

Answer 4

lateral radius

Question 5

Pronator teres: action

Answer 5

pronation

Question 6

Flexor carpi radialis: origin

Answer 6

medial epicondyle of humerus

Question 7

Flexor carpi radialis: insertion

Answer 7

2nd and 3rd metacarpals

Question 8

Flexor carpi radialis: actions (2)

Answer 8

flexion of wrist, abduction of wrist

Question 9

palmaris longus (the one some people don’t have anymore): origin

Answer 9

medial epicondyle of humerus

Question 10

palmaris longus: insertion

Answer 10

palmar aponeurosis

Question 11

palmaris longus: action

Answer 11

weak flexion of wrist

Question 12

what is the palmar aponeurosis

Answer 12

thickening of palmar fascia (connective tissue) - cotinous with the tendon of palmaris longus

Question 13

Flexor carpi ulnaris: origin

Answer 13

medial epicondyle of humerus; olecranon of ulna

Question 14

Flexor carpi ulnaris: insertions (3)

Answer 14

carpals (pisiform, hook of hamate), 5th metacarpal

Question 15

Flexor carpi ulnaris: actions (2)

Answer 15

flexion of wrist, adduction of wrist

Question 16

what is the trick to remember anterior compartment - superficial muscles?

Answer 16

Pass - Fail - Pass - Fail
pronator teres - flexor carpi radialis - palmaris longus - flexor carpi ulnaris

Question 17

Flexor digitorum superficialis: origin (2)

Answer 17

medial epicondyle of humerus, anterior surface of radius and ulna

Question 18

Flexor digitorum superficialis: insertion

Answer 18

4 tendons split and insert on middle phalanges 2-5

Question 19

Flexor digitorum superficialis: actions (3)

Answer 19

flexion of wrist, flexion of metacarpophalangeal joint 2-5, flexion of proximal interphalangeal joints 2-5

Question 20

Flexor digitorum profundus: origin

Answer 20

ulna, interosseus membrane

Question 21

Flexor digitorum profundus: insertion

Answer 21

distal phalanges 2-5

Question 22

Flexor digitorum profundus: actions

Answer 22

same as flexor digitorum superficialis plus flexion of distal interphalangeal joints 2-5

Question 23

Trick to remember flexor digitorum superficialis and flexor digitorum profundus

Answer 23

flexor digitorum superficialis splits in two to allow flexor digitorum profundus to pass through

Question 24

Flexor pollicis longus: origins (2)

Answer 24

anterior radius interosseus membrane

Question 25

Flexor pollicis longus: insertion

Answer 25

distal phalanx of the thumb

Question 26

Flexor pollicis longus: action

Answer 26

flexion of the thumb

Question 27

pronator quadratus: origin

Answer 27

distal anterior surf ace of ulna

Question 28

pronator quadratus: insertion

Answer 28

distal anterior surfa e of radius

Question 29

pronator quadratus: action

Answer 29

pronation

Question 30

What muscles are innervated by the median nerve

Answer 30

all anterior forearm muscles (pronator teres, flexor carpi radialis, palmaris, flexor digitorum superficialis, pronator quadratus, flexor policis longus) except flexor carpi ulnaris and median half of flexor digitorum profundus

Question 31

What muscles are innervated by the ulnar nerve

Answer 31

flexor carpi unlnaris, median half of digitorum profundus

Question 32

What is the flexor retinaculum?

Answer 32

fibrous connective tissue band located on the palmar surface of the hand, near the wrist - holds the tendon of the flexor muscles in place - forms the roof of the carpal tunnel

Question 33

What is carpal tunnel?

Answer 33

flexor retinaculum arches over the carpal bones of the wrist to form the carpal tunnel (across palm of hand)

Question 34

What does the carpal tunnel contain?

Answer 34

tendons of: flexor digitorum superficialis & profundus, flexor pollicis longus median nerve

Question 35

Extensor carpi radials longus and brevis: origin

Answer 35

lateral epicondyle of humerus

Question 36

Extensor carpi radials longus and brevis: insertion

Answer 36

2nd and 3rd metacarpals

Question 37

Extensor carpi radials longus and brevis: actions

Answer 37

extension of wrist, abduction of wrist

Question 38

extensor capri ulnaris: origin

Answer 38

lateral epicondyle of humerus

Question 39

extensor capri ulnaris: insertion

Answer 39

base of the 5th metacarpal

Question 40

extensor capri ulnaris: actions (2)

Answer 40

extension of wrist, adduction of wrist

Question 41

Extensor digitorum: origin

Answer 41

lateral epicondyle of humerus

Question 42

Extensor digitorum: insertion

Answer 42

posterior surfaces of phalanges 2-5

Question 43

Extensor digitorum: actions (2)

Answer 43

extension of wrist, extension of fingers

Question 44

Extension digiti minimi: origin

Answer 44

lateral epicondyle of humerus

Question 45

Extension digiti minimi: insertions (2)

Answer 45

middle phalanx of pinky finger (5th digit), posterior surface

Question 46

Extension digiti minimi: actions (2)

Answer 46

extension of wrist, extension of pinky finger

Question 47

Supinator: origins (2)

Answer 47

lateral epicondyle of humerus, proximal ulna

Question 48

Supinator: insertion

Answer 48

lateral proximal radius

Question 49

Supinator: action

Answer 49

supination

Question 50

abductor pollicis longus: origins (2)

Answer 50

proximal ulna & radius, posterior surface

Question 51

abductor pollicis longus: insertion

Answer 51

1st metacarpal

Question 52

abductor pollicis longus: action

Answer 52

abduction of thumb and wrist

Question 53

extensor pollicis longus: origins (2)

Answer 53

posterior ulan, interosseus membrane

Question 54

extensor pollicis longus: insertions (2)

Answer 54

thumb, distal phalanx

Question 55

extensor pollicis longus: action

Answer 55

extension of thumb

Question 56

extensor pollicis brevis: origins (2)

Answer 56

posterior radius, interosseus membrane

Question 57

extensor pollicis brevis: insertions (2)

Answer 57

thumb, proximal phalanx

Question 58

extensor pollicis brevis: action

Answer 58

extension of the thumb

Question 59

extensor indicis (index finger): origins (2)

Answer 59

posterior distal ulna and interosseus memebrane

Question 60

extensor indicis (index finger): insetrion

Answer 60

index finger

Question 61

extensor indicis (index finger): actions (2)

Answer 61

extension of index finger, extension of wrist

Question 62

anatomical snuffbox: lateral border

Answer 62

abductor pollicis longus tendon, extensor polliccis brevis tendon

Question 63

anatomical snuffbox: medial border

Answer 63

extensor pollicis longus tendon

Question 64

what nerve innervates all posterior forearm muscles?

Answer 64

radial nerve

Question 65

what is the extensor retinaculum?

Answer 65

fibrous connective tissue band located on the dorsal surface of the hand, near the wrist, holds the tendons of the extensor muscles in place

Question 66

what are extrinsic muscles?

Answer 66

muscles of the hand, originate in the forarm and insert on the hand, control crude movements

Question 67

what are intrinsic muscles?

Answer 67

originate and insert within the hand, control fine movements of the hand